Description of problem: 

Evolution won't let me change the local delivery options for account. Is insists
on a directory (it won't let me select a file from the option box), then when
using send/receive it complains "Error while fetching mail. Could not open mail
file /home/xxx is a directory".

Mail is delivered to a users home directory /home/xxx/Mailbox. Even if I edit
.gconf/apps/evolution/mail/%gconf.xml to have the correct value, evolution
overwrites the new value. Even setting the file to read only or owned by root
won't stop evolution overwriting it.

This was discovered just I changed the "check for new mail" value, it appears to
overwrite the other entries no matter what I change.

Also other people are seeing this, I can't use the work around they suggest
though: http://www.fedoraforum.org/forum/showthread.php?t=158161

Version-Release number of selected component (if applicable):
evolution-2.10.3-4.fc7 (all updates applied)

How reproducible: Very

Steps to Reproduce:
1. In evolution, go into a "local delivery" account, change any setting and save
2. Click "send/receive"
3. You should get the above error, nothing I can see will fix it.
  
Actual results:

The above error. No new email delivered

Expected results:

Mail delivered to users inbox.

Additional info:

Now I have tried this on my account, I can't pick up my email :-( So please send
any questions to shakerky@googlemail.com for this bug so I can respond.